CFD investigations of wave interaction with a pair of large tandem cylinders. (1st November 2015)

• Record Type: Journal Article
• Authors: Kamath, Arun; Chella, Mayilvahanan Alagan; Bihs, Hans; Arntsen, Øivind A.
• Is Part Of: Ocean engineering. Volume 108(2015)
• Page Start: 738
• Page End: 748
• Publication Date: 2015-11-01
• Subjects: Wave forces -- Wave interaction -- Vertical cylinders -- Numerical wave tank -- CFD; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2015.08.049
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Wave forces and the flow field around cylinders placed in a periodic wave field are investigated with a numerical model using the Reynolds-averaged Navier–Stokes equations. The numerical model is validated by simulating the wave interaction with a single cylinder and comparing the numerical results with experimental data from a large scale experiment. Then, the wave interaction with a single large cylinder and a pair of large cylinders placed in tandem for different incident wave steepnesses is studied. The numerically calculated forces are compared with predictions from potential theory. The numerical results are seen to match the predictions at low incident wave steepness but differ at higher incident wave steepnesses. The wave diffraction pattern around the tandem cylinders for waves of low and high steepness is investigated and the evolution of a strong diffraction pattern is seen in the case of high steepness waves, which results in the difference between the wave forces predicted by potential theory and the numerical model at higher steepnesses. Abstract : Highlights: Interaction of low and high steepness incident waves with large cylinders. Computed wave forces agree with potential theory predictions at low wave steepness. Computed wave forces lower than potential theory predictions at high wave steepness. Low steepness waves show only a bending of the waveform after diffraction. Several strong semi-circular diffracted waves are formed for high steepness waves.